thank you, thank very much! By setting AS's fallback folder solved the issue. Now it seems to work. Need to test further later when I have more time. lol I made that harder than it needed to be.
Current setup
HTPC: G4560 Kaby Lake, ASRock H110M-ITX, 8 GB, Win10
Server: G2120 Ivy Bridge, ASRock B75 Pro3-M, 8 GB, 22 TB HDD, Ubuntu 16.04.5 LTS
Audio&Visual: Marantz NR-1602, Dali Opticon 6 5.1, SVS PB12-NSD, Sony KD-65A1